JPH04132740A - Saturated polyester bottle and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject bottle excellent in heat resistance and transparency by injection molding a filler-containing saturated polyester into a perform of a plug part, then injection molding the saturated polyester into a perform forming a body part and a bottom part using another molding machine and blow molding the performs. CONSTITUTION:A saturated polyester 20 and a filler-containing saturated polyester 22 are supplied respectively to the first injection molding machine 21 and the second injection molding machine 23. The filler-containing polyester 22 is injected in a mold 24 to form a perform of a plug part 2 and the saturated polyester 20 is then injected in a mold 24 to form a perform 5 constituting a body part 3 and a bottom part 4 of a bottle 1. The resultant performs 5 are subjected to blow molding, thus obtaining the objective bottle 1 having the plug part 2 composed of an unstretched filler-containing saturated polyester containing 40-99.9 pts.wt. saturated polyester and 0.1-60 pts.wt. filler, the body part 3 composed of a stretched saturated polyester and the bottom part 4 composed of an unstretched or stretched saturated polyester.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a saturated polyester bottle and a method for producing the same, and more particularly relates to a saturated polyester bottle having excellent heat resistance and a transparent body and a method for producing the same. .

Technical Background of the Invention and Problems Thereto Conventionally, glass has been widely used as a material for containers for seasonings, oils, juices, carbonated drinks, beer, Japanese sake, cosmetics, detergents, and the like. However, since glass containers are expensive to manufacture, a method is generally adopted in which empty containers are collected after use and reused. In addition, glass containers are heavy, which increases transportation costs, and they also have drawbacks such as being easily damaged (and inconvenient to handle).

In an attempt to overcome these drawbacks of glass containers, there has recently been a rapid shift from glass containers to various plastic containers. Various plastics are used as materials depending on the type of filling contents and the purpose of use. Among these plastic materials, saturated polyester resins such as polyethylene terephthalate have excellent mechanical strength, heat resistance, and transparency. Since it has excellent gas barrier properties, it is used as a material for containers for juices, soft drinks, carbonated drinks, seasonings, detergents, cosmetics, etc. In addition, among these applications, bottles for filling juices, soft drinks, and carbonated drinks are required to be sterilized and filled at high temperatures, so bottles are made of heat-resistant resin that can withstand high-temperature filling. In addition, all of these filling bottles are required to be transparent.

By the way, bottles made of saturated polyester such as polyethylene terephthalate usually consist of a spout, a body, and a bottom.The body is stretch-molded and has molecular orientation, so it has excellent transparency, heat resistance, and Excellent mechanical strength. On the other hand, since the spout and the bottom are hardly stretch-molded, these parts have a problem of poor heat resistance and deformation during sterilization or high-temperature filling.

In order to solve these problems, for example,
Publication No. 33101 discloses a saturated polyester bottle in which only the spout portion is heat-treated and crystallized.

However, saturated polyesters such as polyethylene terephthalate have a slow crystallization rate, so they must be heated for a long time, which causes problems such as being labor-intensive and reducing the dimensional accuracy of the spout. there were.

Furthermore, Japanese Patent Application Laid-open No. 56-2342 discloses a bottle molded from a resin composition comprising polyethylene terephthalate mixed with an inorganic filler. Furthermore, Japanese Patent Application No. 58-20635 discloses a plastic container made of a thermoplastic resin containing an inorganic filler having a specific particle size. However, in the above bottle, since the body is also formed from polyethylene terephthalate mixed with the inorganic filler 1, there is a problem in that the body also has poor transparency.

Purpose of the Invention The present invention aims to solve all of the problems associated with the prior art as described above, and has a structure in which not only the body but also the spout and the bottom have excellent heat resistance, and the body is transparent. The purpose of the present invention is to provide a saturated polyester bottle with excellent properties and a method for manufacturing the same.

Summary of the Invention A first saturated polyester bottle according to the present invention is a saturated polyester bottle consisting of a spout, a body, and a bottom, in which the spout is made of 40 to 99.9 parts by weight of saturated polyester and 0 parts by weight of filler. .1 to 60 parts by weight of filler-containing saturated polyester in an unstretched state, the body part is made of stretched saturated polyester, and the bottom part is made of unstretched or stretched saturated polyester. There is.

Moreover, the second saturated polyester bottle according to the present invention is
In a saturated polyester bottle consisting of a spout, a body, and a bottom, the spout contains an unstretched filler containing 40 to 99.9 parts by weight of saturated polyester and 0.1 to 60 parts by weight of filler. Made of saturated polyester, the body is made of stretched saturated polyester, and the bottom is made of saturated polyester 40
It is characterized by consisting of a filler-containing saturated polyester containing ~99.9 parts by weight and 0.1 to 60 parts by weight of filler.

On the other hand, the first method for manufacturing a saturated polyester bottle according to the present invention includes a first injection molding machine supplied with saturated polyester, and a second injection molding machine supplied with filler-containing saturated polyester containing saturated polyester and a filler. A filler-containing saturated polyester is injected to form a preform cut portion, and a saturated polyester is then injected to form a preform body and bottom using a plurality of injection molding machines having a molding machine. , is characterized by blow molding the obtained preform.

Further, the second method for manufacturing a saturated polyester bottle according to the present invention includes a first injection molding machine supplied with saturated polyester, and a second injection molding machine supplied with filler-containing saturated polyester containing saturated polyester and a filler. Using a co-injection molding machine with a molding machine, the filler-containing saturated polyester is injected to form a preform bottom part, the saturated polyester is injected to mold a preform body part, and then the above-mentioned process is performed. The method is characterized in that the bottom of the preform is formed by injecting a filler-containing saturated polyester, and the obtained preform is blow molded.

DETAILED DESCRIPTION OF THE INVENTION The saturated polyester bottle and the method for manufacturing the same according to the present invention will be specifically described below.

The first saturated polyester bottle 1 according to the present invention has a spout 2, a body 3, and a bottom 4, as shown in FIGS. 1(A) and 1(B). 5 in these figures
indicates a preform for bottle molding.

The spout 2 of this bottle 1 is made of saturated polyester 40 to 9
9.9 parts by weight, preferably 50 to 99 parts by weight, and 0 fillers
．． from 1 to 60 parts by weight, preferably from 1 to 50 parts by weight.

The spout portion 2 as described above is not substantially stretched.

Since the spout 2 is made of filler-containing saturated polyester, it has excellent heat resistance, does not undergo thermal deformation during sterilization or high-temperature filling, and has excellent dimensional stability.

On the other hand, the body 3 of the bottle 1 is made of -axially stretched or biaxially stretched, preferably biaxially stretched, saturated polyester, and may be heat set during bottle molding. Since the body portion 3 is made of stretched and molecularly oriented saturated polyester, it has excellent transparency, heat resistance, and mechanical strength. The area stretching ratio of the stretched saturated polyester forming the body portion 3 is about 3 to 30 times, preferably about 5 to 25 times.

Furthermore, the bottom portion 4 of the bottle 1 is made of saturated polyester that is unstretched or stretched at a low stretching ratio. That is, the saturated polyester forming the bottom part 4 of the bottle 1 is hardly stretched when the bottle is manufactured by blow molding a preform, or is stretched at a low area stretching ratio, for example, about 1 to 3 times.

Next, the second saturated polyester bottle according to the present invention will be explained. As shown in FIG. 2(A) and FIG. 2(B), this bottle 1o has a spout 2, a body 3, ,
It is formed from a bottom part 4, and a spout part 2 and a body part 3 are
Same as the first saturated polyester bottle as described above, the bottom part 4 contains 40 to 99.9 parts by weight of saturated polyester, preferably 50 to 99 parts by weight, and 0.1 to 6 parts by weight of filler.
It is formed from a filler-containing saturated polyester containing 0 parts by weight, preferably 1 to 50 parts by weight, unstretched or stretched at a low areal stretching ratio, for example 1 to 3 times.

By forming the bottom portion 4 from filler-containing saturated polyester in this manner, a bottle with further excellent heat resistance at the bottom portion can be obtained.

Saturated polyester resins used in the present invention include terephthalic acid or its ester-forming derivatives (e.g., lower alkyl esters, phenyl esters, etc.), and ethylene glycol or its ester-forming derivatives (e.g., monocarboxylic acid ester, ethylene oxide, etc.).
Polyethylene terephthalate obtained from is preferably used. This polyethylene terephthalate is approximately 2
Less than 0 mol% of other dicarboxylic acids or glycols may be copolymerized. Such dicarboxylic acid components include, for example, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, diphenoxyethane dicarboxylic acid, adipic acid,
It is derived from aliphatic dicarboxylic acids such as sebacic acid, azelaic acid, and decanedicarboxylic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid. In addition, glycol components include aliphatic glycols such as trimethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, and dodecamethylene glycol, alicyclic glycols such as cyclohexane dimetatool, bisphenols, hydroquinone, , 2-bis(4-β-hydroxyethoxyphenyl)propane and other aromatic diols.

Polyethylene terephthalate, which is particularly preferably used in the present invention, will be explained below. That is, preferable polyethylene terephthalate has the general formula [I] →ooc+coocn CHu-... [I
The content of the ethylene terephthalate component unit (a) represented by Body 2 is 90.0 to 99.5 mol%, preferably 9
The content of the dioxyethylene terephthalate component unit (b) is in the range of 5 to 99 mol%, particularly preferably 97.0 to 98.8 mol%, and is represented by the general formula [11] % formula % [] It is in the range of 0.5 to 10.0 mol%, preferably 1 to 5 mol%, particularly preferably 1.2 to 4 mol%.

Such preferable polyethylene terephthalate is an ester in which the ethylene terephthalate component unit (a) represented by the general formula [I] and the dioxyethylene terephthalate component unit (b) represented by the general formula [11] are arranged randomly. By forming the bonds, a substantially linear polyester is formed. The fact that the polyethylene terephthalate is substantially linear is confirmed by dissolving the polyethylene terephthalate in 0-chlorophenol.

Such preferred polyethylene terephthalate 0-
Intrinsic viscosity [η] measured in chlorophenol at 25°C
is from 0.50 to 1.0 dl/g, preferably from 0.60 to
0.95 617g, particularly preferably 0.62-0.9
It is in the range of 0.617g.

Further, the crystallization temperature (Tcc) of such preferable polyethylene terephthalate when heated at a rate of 10°C/min using a differential scanning calorimeter (DSC) is 130
℃ or higher, preferably in the range of 135 to 185℃, particularly preferably in the range of 140 to 180℃.

Incidentally, the elevated temperature crystallization temperature (Tcct) of the saturated polyester used in the present invention is measured by the following method. That is, a sample 10 mm g thin section from the center of a saturated polyester chip was dried using a PerkinElmer Model DSC-2 differential scanning calorimeter at about 140° C. under a pressure of about 5 m Hg for about 5 hours or more. is sealed in an aluminum pan for liquids under a nitrogen atmosphere and measured. The measurement conditions were as follows: First, the temperature was raised rapidly from room temperature, then melted and held at 290°C for 10 minutes, then rapidly cooled to room temperature, and then the peak of the exothermic peak detected when the temperature was raised at a rate of 10°C/min. Find the temperature.

Fillers used to form the spout and bottom include kaolin, white carbon, talc, sodium benzoate, sodium stearate, barium stearate, antimony trioxide, titanium oxide, calcium carbonate, silica, and glass. Fiber, carbon fiber, etc. are used.

Among these, talc, calcium carbonate, titanium oxide, white carbon, and glass fiber are particularly preferred.

For example, when talc is used as a filler, it primarily functions as a filler, but depending on the molding conditions, it also acts as a nucleating agent, promoting the crystallization of the saturated polyester in the spout and bottom, resulting in excellent heat resistance. A spout and a bottom can be obtained.

Saturated polyester containing such a filler has particularly excellent heat resistance compared to saturated polyester containing no filler. It has particularly excellent heat resistance, does not undergo thermal deformation during sterilization or high-temperature filling, and has excellent dimensional stability.

Note that the spout and bottom made of filler-containing saturated polyester have lower transparency than the spout made of saturated polyester that does not contain filler, but in a bottle, the spout and bottom In this case, transparency is not strictly required, so the practical value is not lost at all.

Next, a method for manufacturing the saturated polyester hottle as described above will be explained.

First, the method for manufacturing the first saturated polyester bottle according to the present invention as described above will be explained with reference to the manufacturing apparatus shown in FIG. Using a plurality of injection molding machines including a second injection molding machine 23 to which a filler-containing saturated polyester 22 containing a saturated polyester and a filler is supplied, the filler is first supplied from the second injection molding machine 23 to the mold 24. The containing saturated polyester 22 is injected to form a preform blank. Note that this preform punching section becomes the mouthpiece of the bottle when the preform is blow molded.

Next, the saturated polyester is injected from the first injection molding machine 21 into the mold 24 to mold the body and bottom of the preform continuously with the preform rolling section.

The preform body and bottom become the body and bottom of the bottle, respectively, when the preform is blow molded.

Next, the preform obtained as described above is blow molded to obtain a saturated polyester bottle.

The blow molding conditions are as shown below.

After heating and maintaining the body and bottom of the preform at a temperature range of 80 to 150°C, preferably 85 to 130°C, stretch the preform in the height direction with a stretching rod, and then apply an air pressure of 5 to 50°C.
100kg/aIr preferably 10-50kg/cIl
Heat setting is performed simultaneously or simultaneously with blow molding in a bottle mold at room temperature to 200°C, preferably at 100°C to 180°C, to improve transparency and heat resistance (hot water at 60°C or higher, preferably 80°C or higher). A saturated polyester bottle with excellent properties (almost no deformation even when filled) can be obtained.

In the saturated polyester bottle thus obtained, the spout is made of filler-containing saturated polyester in an unstretched state containing 40 to 99.9 parts by weight of saturated polyester and 0.1 to 60 parts by weight of filler. The body is made of stretched saturated polyester, and the bottom is made of unstretched or stretched saturated polyester.

Next, the second method for manufacturing a saturated polyester bottle according to the present invention will be described. The first injection molding machine 21 supplied with the saturated polyester 20 and the filler-containing saturated polyester 22 made of the saturated polyester and a filler are Using a plurality of injection molding machines having the supplied second injection molding machine 23, filler-containing saturated polyester 22 is first injected from the second injection molding machine 23 into a mold 24 to form a preform bottom frame. Shape.

Next, the saturated polyester is injected from the first injection molding machine 21 into the mold 24 to mold a preform body part continuously with the preform bottom frame part.

This preform body becomes the body of the bottle when the preform is blow molded.

Next, the filler-containing saturated polyester is injected from the second injection molding machine 23 into the mold 24 to form a preform bottom continuous with the preform body. This preform bottom becomes the bottom of the bottle when the preform is blow molded.

Next, the preform obtained as described above is blow-molded under the same conditions as above to obtain a saturated polyester bottle.

In the saturated polyester bottle thus obtained, the spout is made of filler-containing saturated polyester in an unstretched state containing 40 to 99.9 parts by weight of saturated polyester and 0.1 to 60 parts by weight of filler. The body is made of stretched saturated polyester, and the bottom is made of 40 to 99.9 parts by weight of saturated polyester and 0,000 parts by weight of filler.
1 to 60 parts by weight of filler-containing saturated polyester.

Effects of the Invention In the saturated polyester bottle according to the present invention, the spout has excellent heat resistance and does not undergo thermal deformation, and the body has excellent transparency and heat resistance.

[Brief explanation of the drawing]

Figure 1 (A), Figure 1 (B), Figure 2 (A) and Figure 2
Figure (B) is a sectional view of a saturated polyester bottle according to the present invention, and FIG. 3 is a schematic explanatory view of an apparatus used in manufacturing this bottle. 1.10...Bottle 2...Spout part 3...
Body part 4... Bottom part 5... Preform Fig. 1 (A) Fig. 2 (A) Fig. 1 (B) Fig. 2 (B) □4

Claims (1)

[Claims] 1. A saturated polyester bottle consisting of a spout, a body, and a bottom, the spout comprising 40 to 99.9 parts by weight of saturated polyester and 0.1 to 60 parts by weight of filler. A bottle made of saturated polyester, characterized in that the body is made of a stretched saturated polyester, and the bottom is made of an unstretched or stretched saturated polyester. 2. In a saturated polyester bottle consisting of a spout, a body, and a bottom, the spout is filled with an unstretched filling containing 40 to 99.9 parts by weight of saturated polyester and 0.1 to 60 parts by weight of filler. The body is made of stretched saturated polyester, and the bottom is made of saturated polyester 40.
A bottle made of saturated polyester, characterized in that it is made of unstretched or stretched filler-containing saturated polyester containing ~99.9 parts by weight and 0.1 to 60 parts by weight of filler. 3. Filling using a plurality of injection molding machines having a first injection molding machine supplied with saturated polyester and a second injection molding machine supplied with filler-containing saturated polyester consisting of saturated polyester and filler. The method is characterized by injecting agent-containing saturated polyester to mold the preform mouthpiece, then injecting the saturated polyester to mold the preform body and bottom, and blow molding the obtained preform. Method of manufacturing saturated polyester bottles. 4. Filling using a plurality of injection molding machines having a first injection molding machine supplied with a saturated polyester and a second injection molding machine supplied with a filler-containing saturated polyester containing a saturated polyester and a filler. Filler-containing saturated polyester as described above is injected to form the preform mouthpiece, saturated polyester is injected to form the preform body, and filler-containing saturated polyester as described above is injected to form the preform bottom. A method for producing a saturated polyester bottle, comprising molding the preform and blow molding the obtained preform.